72112181191 has 4 divisors (see below), whose sum is σ = 72162505152. Its totient is φ = 72061857232.

The previous prime is 72112181179. The next prime is 72112181201. The reversal of 72112181191 is 19118121127.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72112181191 - 2²⁵ = 72078626759 is a prime.

It is a super-2 number, since 2×72112181191² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72112181161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25159831 + ... + 25162696.

It is an arithmetic number, because the mean of its divisors is an integer number (18040626288).

Almost surely, 2^72112181191 is an apocalyptic number.

72112181191 is a deficient number, since it is larger than the sum of its proper divisors (50323961).

72112181191 is a wasteful number, since it uses less digits than its factorization.

72112181191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50323960.

The product of its digits is 2016, while the sum is 34.

The spelling of 72112181191 in words is "seventy-two billion, one hundred twelve million, one hundred eighty-one thousand, one hundred ninety-one".